en:manualy:treq - Příručka ČNK

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====== Treq ======

{{ :manualy:treq.png?direct&200|}}

The [[http://treq.korpus.cz|Treq]] application serves for searching Czech - foreign language dictionaries, which have been automatically created based on data derived from the parallel corpus [[en:cnk:intercorp|InterCorp]]. It enables users to search for all possible equivalents used in translations, or to find synonyms.

Treq is an online application (the only thing we need to use it is a web browser) and it is accessible without [[en:kurz:zaciname|registration]] to all users at **[[http://treq.korpus.cz|treq.korpus.cz]]**.

To use Treq, start by specifying the desired language pair by selecting source language (the language of the query) and target language (the language of the potential equivalents). The query can be entered either as a specific word form, as a lemma (//Lemma//), as a multiword unit (//Multiword//) or using regular expressions (//RegEx//). The query can also be made case insensitive (//A = a//). Depending on the //Restrict to:// parameter, result retrieval can target different text types: the fiction-oriented core texts, specific collections, or the entire corpus. Then enter your query (//Query://) and click //Search//. The query result is a list of all translation candidates of the given word, sorted by decreasing frequency by default. By clicking on a particular candidate, you can browse its occurrences in InterCorp and check the translation contexts. The reported frequency may differ since the corpus query may also find instances where the potential equivalent corresponds to a different word. 

===== Alignment principle =====

First of all, when preparing data for Treq, only sentences that are aligned 1:1 are selected from the entire corpus. We restrict ourselves to this simple alignment because it tends to be more reliable; especially in the case of automatically aligned texts, potential errors can be prevented.

The next step is to perform an automatic word-to-word alignment using GIZA++ ((see [[http://dx.doi.org/10.1162/089120103321337421|Och–Ney 2003]])). In older versions of Treq, a method called //intersection// was used, creating only such alignments where one word in the source language corresponds to one word in the target language, e.g.:
 
{{:manualy:carky_int.jpg?300|}}

{{:manualy:carky_int_spoustu_lidi_to_nastvalo.jpg?450|}}

i.e. the first word in the source language (0) corresponds to the first word in the target language (0), the second word (1) corresponds to the third one (2) etc. Starting with release 2.0, apart from this simple alignment method the //grow-diag-final-and// method has also been used, as it allows to create more complicated alignments of more than one word on both sides of the translation. Such an alignment may look like this: 

{{:manualy:carky_gdfa.jpg?300|}}

{{:manualy:carky_gdfa_spoustu_lidi_to_nastvalo.jpg?450|}}

(Note the difference: the first word in the target language (0) now corresponds not only to the first (0), but also the second (1) word in the target language.)

From such an alignment we choose, using a simple script, the largest possible number of combinations of words that this alignment allows. In both cases, the aligned pairs of (multiple) words are then sorted and summarized. The result of this automatic excerption is not revised in any way. However, the relative frequency of the corresponding pairs may serve as an indicator of the relevance of the equivalents. The more often the equivalent of the word or multi-word unit occurs in comparison with other equivalents, the greater the likelihood that it is a plausible translation.

The table below indicates in what proportion the frequencies found in the KonText are with those displayed by Treq. It also specifies the different data types at each stage of their processing for Treq, considering the IC v9 English component (multi-word variant).

{{:en:manualy:treq_tab_en.png?900|}}

Step by step, you can see the gradual loss of data that is used in the resulting dictionary. In the first step, we only use 1:1 sentence alignment - thus 20.7% of sentences are lost. Subsequently, multi-word equivalents are selected based on alignment made by the GIZA++ tool. However, the relationship between the size of the original corpus and the number of extracted equivalents can not be clearly predicted, especially in multi-word equivalents, where various combinations of the same words arise (see bold pairs below). For example, an alphabetical list of Czech-English couples extracted from the second example sentence would look like this:

//a – and//

//chybný – bad//

//krok – move//

//lidí – people//

//naštvalo – angry//

//**považovalo – been widely regarded as**//

//**považovalo za – been widely regarded as**//

//**považovalo za – regarded a**//

//se – made//

//Spoustu – lot of//

//to – This//

//to – very//

//**za – regarded a**//

//. – .//

In the third step, lines that are the same on both sides of the alignment are added together throughout the text. This will give us the list and the frequency of the equivalents. Finally, in the final step, we exclude all the counterparts containing the punctuation in order to get the final version of the dictionary. For all language pairs where the lemmatization is available on both sides of the alignment, we apply the same procedure to the lemmatized form of data (//na počátek být stvořit vesmír . – in the beginning the universe be create .//).

===== Application pictures =====

[{{:manualy:home.png?direct&300|Input form}}]
[{{:manualy:basic.png?direct&300|Simple searching in the German-Czech section}}]
[{{:manualy:regex.png?direct&300|Advanced searching (via RegEx) in the English-Czech section}}]

==== Related links ====

<WRAP round box 50%>
[[en:manualy:kontext:index|KonText interface]] • [[syd|SyD]] • [[morfio|Morfio]] • [[kwords|KWords]] • [[en:pojmy:korpusovy_manazer|Corpus Manager]] • [[en:pojmy:nastroje|Corpus tools]]
</WRAP>
Trace: • klasifikace_textu_syn2015 • napoveda • multiword • struktura • verze7 • verze3 • srovnatelny • lemtag_mluv • syn • citace
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